Knox Sales Company

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Gas Troubleshooting Guide
Removal And Replacement Of The Gas Control Valve and/or Thermostat Involve The Disconnection Of Gas Piping, Manifold Tube, Pilot Tube, And Thermocouple. It Is Recommended That This Procedure Be Performed By A Qualified Service Technician.
Problem Possible Cause(s) Corrective Action
Insufficient Hot Water
  1. Low gas pressure
  2. Thermostat set too low
  3. Sediment or lime in tank
  4. Water heater too small
  1. Check with gas utility company
  2. Turn temperature dial to higher setting
  3. Drain/flush-provide water treatment if needed
  4. See Sizing Guides
Slow Hot Water Recovery
  1. Thermostat set too low
  2. Heater too small
  1. Turn temperature dial to higher setting
  2. See Sizing Guides
Drip From Relief Valve
  1. Excessive water pressure
  2. Heater stacking
  1. Use a pressure reducing valve and relief valve.
  2. Lower the thermostat setting
Smelly Water
  1. Sulfides in the water
  1. Replace the magnesium anode with a AR-3612 anode
Condensation
  1. Temperature setting too low
  1. Increase the temperature setting. See owner's manual.
Thermostat Fails To Shut Off
  1. Improper calibration
  1. Contact technician to replace thermostat
Pilot Will Not Light or Remain Lit
  1. Low gas pressure
  2. Air in gas line
  3. No gas
  4. Dirt in gas lines
  5. Pilot line or orifice clogged
  6. Thermocouple connection loose
  7. Thermocouple
  8. Thermostat ECO switch open
  1. Check with gas utility company
  2. Bleed the air from the gas line
  3. Check with gas utility company
  4. Notify utility-install dirt trap in gas line
  5. Clean, locate source and correct
  6. Finger tighten-then 1/4 turn with wrench
  7. Contact technician to replace thermocouple
  8. Contact technician to replace thermostat
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